Detonator delay elimination method for coal mine shock wave velocity inversion

Abstract

The invention discloses a detonator delay elimination method for coal mine shock wave velocity inversion and is suitable for the technical field of coal mining and coal mine safety. The method is characterized by, to begin with, marking and analyzing P-wave first arrival time of a shock wave recorded by a probe; calculating distance between each shot point and the probe; carrying out relation fitting through a linear least square method to obtain relation between the P-wave first arrival time and the distance and calculating detonator delay; and finally, eliminating the detonator delay to obtain corrected P-wave arrival time. The method can eliminate the detonator delay, so that actual propagation time of the P wave in a coal-rock mass can be calculated accurately, and accuracy and reliability of coal mine shock wave velocity inversion are improved; and the method is reliable in result, wide in application range and easy for computer programming.

Description

technical field [0001] The invention relates to a method for eliminating the delay of a detonator in the inversion of shock wave velocity in a coal mine, and belongs to the technical field of coal mining and coal mine safety. Background technique [0002] Coal mine shock wave velocity inversion technology can be used for coal mine rock burst risk assessment and early warning. It is based on the positive correlation between P wave velocity and stress. High-resolution acquisition of stress distribution characteristics inside coal and rock mass has been widely used in coal mine rock burst disaster assessment and early warning. During the operation of the shock gun as the excitation source, explosives are generally installed along the groove on one side of the unmined working face for blasting excitation, and the probe is placed along the groove on the other side to receive the shock wave signal. The initial arrival time of the wave is marked and analyzed, and the wave velocity...

AI Technical Summary

Problems solved by technology

However, in actual construction, because workers often confuse the use of detonators with different numbers of segments, and the delay expectations of different numbers of detonators are different, even the detonators with the same number of segments satisfy the characteristics of normal distribution, which leads to the first arrival of the P wave recorded by the receiving probe At that time, it is not entirely because the propagation time of the shock wave in the coal and rock mass is also different from the delay of the detonator of the same segment, which is obviously unfavorable for the high-precision inversion of the shock wave velocity.

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